Just do this in this directory:
docker build -t makefly:latest .
docker run -p 8080:80 -t -i --name makefly makefly:latest /bin/bash
And you will enter in the docker image. Makefly is located in /opt/makefly-master.
Do this:
cd /opt/makefly-master
./makefly
You will see the list of available commands.
To see the result of what Makefly do, you can consult your local webbrowser to the given address: http://localhost:8080/.